A long one.. but very informative !
Update on my 'Quest to play LIVE with a Stadium XL and a vintage Fender Deluxe reverb' .
I'm new in the amp modeling pedalboard's needs
for good sounding. After many replies from nice Helix users
it seamed to me that someone cannot connect a Stadium
directly to the front of a vintage Fender amp.
Sure ??
Well if someone patient and tenacious (like me) do some
technical readings with meters and oscilloscope
it can crack this myth..
Here is why:
Making some browsing about common Fender amp's tone stack freq response
I found that even with its Bass & Treble controls set to 50%
These Fender amps have an agressive 'scooped' EQ at around 500hz from the start !
See the attached graph..
So to 'correct' this very curved freq response
I connected my Stadium to the Fender NORMAL channel (no 250pf bleed cap on Vol),
Then I connected a signal generator to the stadium input #1.
I chose an empty pedal line and placed the 10 band graphic EQ.
Then I set the output line to 1/4" connector #1 'instrument' type.
I swept the input with a 100mv sinus from 50hz to around 10khz.
and at each of the 10 band EQ slide values I corrected
the measurement I had to the Fender speaker (8 ohms dummy load to spare my ears)
so I made all the measurements there.
Sweeping the frequencies I saw the correcting curve emerge
on the 10 band EQ. The 500-1khz region needed to be boosted
because of the Fender EQ scooped nature in that region,
then some highs starting from 4khz to 16k also needed
to be lowered. Now I know this EQ curve will make my Fender behaving flat in freq response.
I saved my EQ block settings for latter uses.
To test it I used the factory preset named Double Double (Stevie Ray Vaughn ??),
copied it into an empty USER presets section,
removed all the pedals but kept the amp/cab blocks.(2 x US Double Black amps).
I then put the cab to OFF and placed my 10 band EQ block right after it.
And I removed one of the two amps that were in the Double Double original preset,
and kept only one (set to clean).
See the attached Helix Stadium screen snaphot..
Now you know what ?
Setting to OFF both the amp + EQ on the rig line (straight signal)
to the ext Fender sounded about the same as putting the amp/EQ back ON !
To conclude:
Can someone connect a Stadium XL
directly to the front of a vintage Fender amp and play LIVE ?
The answer is YES ! Use this EQ settings with your NORMAL channel .
Without selling my vintage stuff to buy
new amp with SEND/RETURN connectors.
BTW, message for vintage Fender amp users:
Just use my EQ setup (placed just after the amp model you'll choose, with cab OFF),
The Stadium connected to your Fender vibrato channel and you won't have
to struggle to get a fine tone while trying new amp/cab models !
And to wrap up; The only distortion pedal
that fitted in front of the amp model I used was the Valve Driver
because of it has Bass + Treble and a nice clipping sound.
MANY of the other overdrive/distortion pedals
only had a TONE to tweak the sound which is very limitating (at least to me)
and produce a muddy or very MID oriented sound which destroy the amp model sound.
Because I 'decyphered' the possible amp to use with a Stadium XL myth
I decided to keep it and not return it.
Have a nice day.